Self-locking door-lock.



l. W- LINDBERG.

SELF LOCKING DOOR LOCK. APPLICATION FILED MAYIB. 1917.

1,244,872. A Patented Oct; 30, 1917.

O z u? 1 /9 [raven/or 4 I ZQMW JOHAN WALDEMAR LINDBERG', OF STOCKHOLM, SWEDEN. v

SELF-LOCKING DOOR-LOCK.

Specification of Letters Extent. Patented Oct. 30,, 1 917,,

Application filed May 18, 1917. serialiNo. 169,496. r

Toall-owho m it may concern 7 Be it known that I, JQHAN VVALDEMAR LINDBERG, a subject of the King of Sweden,

residing at Stockholm, in the Kingdom Of Sweden, have invented a new and useful Improvement in Self-Locking Door-Locks, of. which the following is a specification.

This invention relates to an improvement in such door-locks in which the latch-bolt is beveled off so that when closing the door,

it becomes pushed into the lock casing owing to the pressure. on the beveled surface,

againto snap into locking position when the door, has assumed its closed position. In: order that the closing may be effected in the;

said manner, the bolt must be in suchposition preparatory to the closing of the door that only the bevel projects beyond the face plate of thelock. tofore in use, the latch bolt must bebroughtto this intermediate position by means of a key or in, some other manner before shutting the door, but this may easily be forgotten, or the adjustment may be incomplete-or incorrectly done on account of defects in the mechanism of the lock. Efforts have also been made to design lockswherethis adjustment of the bolt is effected automatically when opening the lock, butthe arrangements have become far too complicated and; thus unreliable in working, particularly in so far as-the bolt, even if it has been brought into its intermediate position, may still fail to return to its final. locking-position. The present invention has for its purpose to The invention isavoid these drawbacks. principally characterized by this, that the olt-actuating member is provided; with v a projection or the like: coacting with a hookor the like on the latch bolt, or with some part connected with the same, in such Infil nerthat when the bolt-actuating member has retracted the bolt entirely in order to open;

the lock, and both of them returnzoutward to locking position (actuated by springs), the projection on the bolt-actuating member will engage the hook on the bolt in such manner that this latter is retained in the intermediate position in which its beveled surface is in such position as tobe acted uponfor pushing back the bolt when .the door is being closed. j

In the accompanying drawing the mterlor l of a door-lock a ra ged according tosthe present invention, is shown by way ofexample. Figure 1 shows the locking position,

In locks of this kind herer Fig. 2 the unlocked position, Fig. '3lthe intermedlate position; adjusted :for shuttingthe door, and Fig. 4 the latchbolt lockedinopen posltion.

Thelatch bolt 1 is connected with. a plate 21thefront edge 3 of which bears againstthe provided with a shoulder 4 at right angles;

to the bolt, the latter shoulder being formed into a hook '5 at its upper end. The bolt is: made so that it may be turned and used:

either for. right-hand or for "left-hand locks in known manner, and the turning of the latch bolt is effected simply by loosening the 1 bolt from the plate 2, theshoulderl andv the hook 5 of which remain in unchanged position; In the lock casing abovev the .latehbolt f there isfulor-umed a lever 6 (the securing;

hook) thejhooked end 7 of which; may coact with a projection 8 on the plate 2 so -as,- to

lock the ElOOlt in its end positions. Thesaid le ver is also provided witha lug .8 which'pro jectsinto the path ofthe upper endl'O, of the bolt-actuatingmember ,9 so that the levers may be actuated by the member :9,in order to,

release the bolt.' The bolt-actuating member head of the bolt and the rear end of-wh'ichis,

is also provided with a projection on a lug ll; I I

which presses against the shoulder l of the plate 2, when the bolt-actuatingmember is turned, and" moves the bolt' from looking position rearward to open position, A spring is illustrated'at 1 9 andis preferablyeoiled around and anchored to a suitable stud 20,,

one 'end'zof said spring bearing against the inner .end of the bolt" 1 and acting to urge,

said bolt outwardly, while the other end;

thereof bears upwardly against the shoule der 9 formed on the bolt-actuating member 9 and i adapted to rock a d bo -ac at ng; member-9 in one direction. Itiwill therefore be notedthat said spring 19 is lcommon; o to both the bolt and the -b0lt -a0tl1ating meInber and1acts to operate both. (jFig, Vhen; the bolt moves outward toward the locking position actuated by the spring 19, the lug 1 1 slides upward along the shoulder, 4: .unt-ilitengages the hook 5 formed at, the end ofthe said shoulder. The latchbolt is then in anintermediate position l(Fig. 3 in which its beveled portion only projectsonb;

sidethe lock casing. fIn locking position the a bolt projects so far out that a plane portion, (parallel with the direction of movementpf he bolt) wi lca so r ach outside the. 1 c ,c'a

ing (Fig. 1); The bolt-actuating member has a projecting arm 12 close to the hub, and

located in the path of a lever 13 which may be operated by the key 14. Besides, the look is provided with tumblers 15, and the moving parts are in known manner actuated by means of springs.

When the bolt assumes its extreme protracted or looking position, it is locked by the front end of the lever. 6 bearing against.

the projection 3 on the plate 2 (Fig. 1).

When the key is turned for opening the lock,-it presses against the lever 13 which then acts upon the bolt-actuating member 9 so that this latter lifts the lever 6 and releases thebolt. On continued turning of the bolt-actuating member 9, the lug 11 of the same forces the bolt rearward to open posi When the key is then re-' tion (Fig. 2). I leased, the bolt is driven outward by the spring 19 and brings along the bolt-actuat ing member, the lug 11 of whichthen' slides along the shoulder 4 until it engages the hook 5, when the further outward movement of the bolt is prevented. The bolt now assumes the above-mentioned intermediate position (Fig. 3) in which its beveled portion only projects on the outside of the lock casing, and its obliquesurface is then in time the bolt is also pushed forward under the action of said spring 19 and assumes the final'lockingposition shown in Fig. 1. By

this arrangement it is thus always guaran-,

teed that when the door isbeing shut, the position, of the latch bolt is such'that the bolt may be forced rearward. If the door is tostand unlocked, the bolt is drawn back by turning the key 14 or 'a handle (not shown) secured to the bolt-actuating memher. 9, to the position shown in Fig. 2, and before releasing the key or the handle the bolt is pushed farther in by hand until the hooked end'7 of the lever 6 falls down before the projection 3 of the plate 2 (Fig. 4i)v and maintains the bolt in its pushed-in position, At this pushing in of the latch bolt a lug 18 on the plate2 serves to stop the forward movement of .the boltactuating member,.when the keyor the handle is released, sorthat the outer end 10 of the said member must stay behind the lug 8 on the lever 6. as shown in Fig. t. When the door is jagain to be locked, the bolt-actuating member is moved so that the lever 6 is lifted and the .bolt is released and pushed by its spring into'locking position. The last mentioned movement of the bolt-actuating member must take place forward, that is to say, to the left in Fig. 1, on account of the. bolt actuatingmember having been moved behind the lug 8 by the lug 18 at the pushing in of the bolt, and the bolt-actuating member is thus prevented from entering the notch 5' and stopping the bolt in its interme diate position which might happen if the bolt-actuating member were instead to be moved to the right. I

It is obvious that various changes and modifications may be made in the detailed construction herein illustrated and described and the right is therefore reserved to make such changes and modifications as fall within the scope of the appended claims.

1. A'door lock of the type described comprising a beveled bolt, a hook connected to said bolt, a bolt-actuating member, a lug on said bolt-actuating member, resilient means common to said bolt and to said bolt-actuating member adapted to effect an engagement between said lug and said hook when saidbolt has been retracted to a position intermediate its maximum retracted and maximum extended positions. to thereby retain said bolt in such intermediate position, and means whereby said bolt is automatically locked in its maximum extended position when the door is closed. v i

2. A "door lock of the type described comprising abeveled bolt, a plate connected to said bolt, a shoulder at the inner end of said plate, a hook at thetop of said shoulder, a bolt-actuating member, and a lug on said bolt-actuating member adapted to slide againstsaid shoulder and to engage, said hook to thereby retain said bolt in a position intermediate its maximum retracted position andits maximum extended position, thereby affording means whereby. said bolt may be actuated by the engagement of the beveledv portion thereof withthe .jamb' es cutcheon when the door is being closed.

I, 3'. Adoor lock of the typedescribed com prising a bolt, a shoulder .on said bolt, a hook on said shoulder, a lever adapted to lock said bolt in its maximum retracted position and in its maximum extended position," a bolt-actuating member cooperating with said lever and with said shoulder to disengage said lever. and to retract said bolt and m eans on said bolt-actuating member adapted to engage said hookwhen said bolt has been retracted to a position intermediate its maximum retracted and maximum eX- tended positions and to retain saidbolt in such intermediate position. p p H 4;. .Aydoor lock of. the type described comprising a bolt, a shoulder on saidbolt, a hook on said shoulder, a lever adapted to lock said bolt in its maximum retracted position and in its maximum extended position, a bolt-actuating member cooperating With said lever and With said shoulder to disengage said lever and to'retract said bolt, and means on said bolt-actuating member adapted to engage said hook when said bolt has been retracted to a position intermediate its maximum retracted and maximum extended positions and to retain said bolt in such intermediate position, said bolt being automatically looked in its maximum extended position when the door is closed.

JOHAN WVALDEMAR LINDBERG.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. i 

